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NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Introduction and Snapshot of Dual Nature of Radiation and Matter - Study ref# 836

Introduction: The Maxwell’s equations of electromagnetism and Hertz experiments on the generation and detection of electromagnetic waves in 1887 strongly established the wave nature of light. Towards the same period at the end of 19th ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Introduction and Snapshot of Dual Nature of Radiation and Matter - Study ref# 837

Following sections must be covered to understand the Dual Nature of Radiation: 1. Introduction 2. Electron Emission 3. Photoelectric Effect 4. Experimental Study of Photoelectric Effect 5. Photoelectric Effect and Wave Theory ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Target Setup for Dual Nature of Radiation and Matter - Study ref# 838

Student requires to achieve the following milestones to get better grip over Dual Nature of Radiation And Matter. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Tes... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10682

Name the phenomenon which shows the quantum nature of electromagnetic radiation. Answer: Photoelectric effect (Raman/Compton effect)... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10683

State one factor which determines the intensity of light in the photon nature of light Answer: Number of photons emitted per second determines the intensity of light in the photon nature of light.... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10684

State one reason to explain why wave theory of light does not support photoelectric effect. Answer: According to wave theory same intensity of different light colours should have same energy but experiment shows that energy depends upon freq... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10685

Define intensity of radiation on the basis of photon nature of light. Write its S.I. unit. Answer: The amount of light energy/photon energy, incident per metre square per second is called intensity of radiation. S.I unit: read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10686

In photoelectric effect, why should the photoelectric current increase as the intensity as the intensity of monochromatic radiation incident on a photosensitive surface is increased? Explain. Answer: Increase in intensity of the incident ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10687

Draw graphs showing variation of photoelectric current with applied voltage for two identical radiations of equal frequency and different intensities. Mark the graph for the radiations of higher intensity Answer: ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10688

Write Einstein’s photoelectric equation. Explain the terms (i) threshold frequency and (ii) stopping potential. Answer: (i) Einstein’s photoelectric equation, K.E. of photoelectron = Incident energy of photons – Work function             ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10689

Write three basic properties of photons which are used to obtain Einstein’s photoelectric equation. Use this equation to draw a plot of maximum kinetic energy of the electrons emitted versus the frequency of incident radiation. Answer: Three... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10690

Find the frequency of light which ejects electrons from a metal surface, fully stopped by a retarding potential of 3.3 V. If photo electric emission begins in the metal at a frequency of  , calculate the work function (in eV) for this metal.... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10691

Two monochromatic radiations of frequencies  and  (and) and having the same intensity are, in turn, incident on a photosensitive surface to cause photoelectric emission. Explain, giving reason, in which case (i) more number of electron... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10692

Plot a graph showing the variation of stopping potential with the frequency of incident radiation for two different photosensitive material having work function  and ( >). On what fac... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10693

X-rays fall on a photosensitive surface to cause photoelectric emission. Assuming that the work function of the surface can be neglected, find the relation between the de-Broglie wavelength () of the electrons emitted to the energy ( read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10694

(a) In a photoelectric effect, do all the electrons that absorb a photon come out as photoelectrons irrespective of their location? Explain (b) A source of light, of frequency greater than the threshold frequency, is placed at a distance‘... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10695

The following graph shows the variation of photocurrent for a photosensitive metal:                       (i) Identify the variable X on the horizontal axis. (ii) What does the point A of the horizontal axis represent? ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10696

A particle is dropped from a height H. The de-Broglie wavelength of the particle as a function of height is proportional to (a) H. (b) . (c) read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10697

Consider the given figure. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of that (a) Will be larger than the earlier value (b) Will be the same as the earlier value (c) Will be less... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10698

A proton, a neutron, an electron and an -particle have same energy. Then, their de-Broglie wavelengths compare as (a)   (b) (c) read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10699

An electron (mass m) with an initial velocity  is in an electric field. If its de-Broglie wavelength at time t is given by (a)   (b) read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10700

Draw a plot showing the variation of de-Broglie wavelength of electron as a function of its K.E. Answer: ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10701

Find the ratio of de-Broglie wavelengths associated with two electrons accelerated through 25 V and 36 V. Answer:   De-Broglie wavelength of an electron                                     ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10702

An particle and a proton are accelerated through the same potential. Find the ratio of their de-Broglie wavelengths. Answer: De-Broglie wavelengths is given by                              ... read more

NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Study ref# 10703

Draw a graph showing the variation of de-Broglie wavelength  of a particle of charge q and mass m, with the accelerating potential V. An particle and a proton have the same de-Broglie wavelength equal to 1. Explain with calculations, w... read more

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